function map (el) {
this.el=el
this.width='800'
this.height='400'
}
map.prototype.create=function() {
    this.el.style.width=this.width+'px'
    this.el.style.height=this.height+'px'
    this.el.style.background='url(./bg.png)'
    this.el.style.border='10px solid gold'
    this.el.style.position='relative'
}